Pump.



PATENTED APR. 2, 1907.

J. H. BURKHGLDER.

PUMP.

APPLICATION FILED JULY 12, 190s wth.

NL e

JOHN H. BURKHOLDER, OF ASHLAND, OHIO.

PUMP.

VSpecification. of I'Aetters Patent.

.Patented April 2, 1907.

Application filed July 12, 1906. Serial No. 325,903.

To (LZ 111/110711, it may concern.'

Be it known that I, JOHN H. BURKHoLbER, a citizen of the United States, residing at Ashland, in the county of Ashland and State of Ohio, have invented new and useful Improvements in Pumps, of which the following is a specification'.

This invention relatesio improvements in pumps, and more particuln'iyt to a compound air-pump.

The object of the invention is to provide a device of this character which will be of simple, compact, and durable construction and very powerful in operation.,

The above and other objects, which will appear as the nature of the invention4 is better understood, are accomplished by the construction illustrated in the accompanying drawings, in which- Figure 1 is a side elevation of the improved pump. Fig. 2 is a vericlsection of the same, and Fig. 3 is a detafLsectional view through the pistons.

In the present embodiment of the invention I provide two cylinders 1 and 2, the former of which is of greater diameter than the latter. These cylinders have their lower ends screwed or otherwise secured in a suitable base 3, .here shown in the form-of a loop adapted. to receive the foot of the operator. In an extended portion of the base 3 is formed a passage 4, having one end in communication with the smaller cylinder 2. In the opposite end of the passage 4 is screwed a nipple 5, adapted to receive a flexible tube or hose 6, which carries at its free end the usual valve connection 7. The upper end of the cylinder 1 is closed by a screw-cap 8, and the upper end of the cylinder 2 is closed by a screw-cap 9, in which latter is provided a packing-gland 10 of well-known form.

In connection with the cylinders 1 and 2 I employ a hollow or tubular operating V- shaped element 11, which has two arms 12 13, adapted to reciprocate in said cylinders and to carry pistons 14 and 15. These pistons 14 and 15 are in the form of cup-shaped disks of leather or the like secured between metal plates or disks by means of nuts, as clearly shown in Figs. 2 and 3 of the drawings. The tube or hollow rod 12 is adapted to slide freely through the cap S and to have in its lower end, which opens beneath the piston 14, a check-valve 16 of any suitable form and construction which will permit of the inlet of air into said tube 12. The tube or hollow rod 13 is adapted to slide through the cap 9 and its packing 10 and has itslower end closed, as shown at 17. In the lower end of this tube 13 above its piston 15 is formed an outlet opening or aperture 18. The upper ends of the tubes 12 'and 13 are screwed or otherwise secured in a hollow or tubular connecting-arch 19, which permits of free passage of air from the tube 12 to the tube 13. The arch or yoke 19 is preferably in the form of a casting. and has at its top an upwardlyprojecting screw-threaded stud 20, on which is rotatablymounted across-bar or handle 21.

The operation of the ump is as follows: Upon the upstroke of t e operating frame or element 11 the air in the cylinder 1 above the piston 14 will pass beneath the latter, and at the same time the air in the cylinder 2 above the piston 15 will pass beneath said piston, the air being forced. between the'side walls of the cylinders 1 and 2 and the flexible depending iianges of the cup-shalped disksof the pistons. Upon the downstro e of the element 11 air will be d r- .wn in the cylinder 1 through apertures, as the iston 14, and air in said cylinder beneatii said piston will be compressed and forced through the check-valve 16 into the arm or tube 12 and is forced upward therethrough and through the arch 19 into the arm or tube 13, from which it escapes through the opening 18 and enters the cylinder 2, while the air 1n the cylinder 2 beneath the piston 15 is forced out through the passage 4 and discharged from the hose or other connection 6. It will be observed that the construction of the device is exceedingly simple and compact, so that the pump may be manufactured at a comparatively small cost and will be very durable in u`se. It will also be seen that it is very powerful and at the same time convenient and easy to operate.

While I have shown and described the preferred embodiment ofthe invention, it will be understood that I do not wish to be limited to the precise constructionherein set forth, since various changes in the form, proportion, and minorA details of construction may be made without departing from the spirit or sariiicing any of the advantages of the invention as defined by the appending claims.

Having described my invention, what I 8o in the cap 8, above ICO l3o said small ,cylindervha'vingan outlet, a-tubular operating-:element having hollow armsin claim, ,newanddesire .to secure -by Letters 1 In apmp the combination of a pair of cylinders arrangedpara'llel to peach other, a tubular U-shaped hollow element havin its legs operating in said cylinders and Aprovided s a'id arms. havingits inner end opening upon :the opposite side of its piston.

3 In' a pump, cylinders, a tubular-operating ielementha'ving"hol-low arms, pistons upon Asaid arms and a valve in one of'said arms, the

other of said arms having an aperture adj a- 'centv to its closed end.

4: `In a pump, cylinders, a-tubular operating element having hollow arms to recipro- -cate=in said cylinders, one of said cylinders fhaving an-outlet connection, pistons upon said arms,the arm inthe last-mentioned cylinder having its inner end-closed and an aperzture adjacent to saidclosed Aend -an'clabove the piston on said arm, and a Vcheck-valve in the other ofsaid arms.

`5. -In a pump, large andsmall cylinders,

`A`communication with each other, pistons upon -said arms in said cylinders, lthe arm in said small cylinder having a closed inner end and .an :aperture above l'its-piston, and a. check;

valve in 'theiopen'end'iof the arm vin said large cylinder.

6.' :In a-pump, albase, cylinders projecting therefrom, an outlet connection for said base l-in one of said cylinders, closures for the outer ends of said cylinders, a tubular operating element comprising hollow arms adapted to reciprocate in said closures and a hollow arch connecting said arms, valves upon said arms within said cylinders, one of said arms .hav-

ing its inner end closed and formed with an aperture above its valve and a check-valve in the open inner end of the other of said arms.

7 .In a pump, a base, cylindersprojecting therefrom, an outlet connection in said base for one of said cylinders, closures for the outer ends of said cylinders, a tubular operating element comprising hollow arms adapted to reciprocate in said closures and a hollow arch connecting said arms, valves uponsaid arms Within said cylinders, one of said arms having its inner end closed and formed with an aperture above its valve, a check-valve in the open inner end of the other of said arms, a foot-loop upon said,- base, and a handle upon the connecting-arch of said operating element.

In testimony whereof I'have hereunto set my hand inthe presence. of twosubscribing witnesses.

YJOHN' -BURKHOLDER Witnesses:

CHAs. R. MILLER,

ROTHENBERG. 

